Declare user_email when setting up fixtures for `count_user_posts()` tests.

Because `setUpBeforeClass()` is called statically and creates its own factory
object, the iterator logic from previous tests is not carried over to these
fixtures, and we risk the possibility of user_email clashes when the tests are
run in certain limited configurations.

git-svn-id: https://develop.svn.wordpress.org/trunk@30512 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/user/countUserPosts.php

@@ -14,6 +14,7 @@ class Tests_User_CountUserPosts extends WP_UnitTestCase {
 		self::$user_id = $factory->user->create( array(
 			'role' => 'author',
 			'user_login' => 'count_user_posts_user',
+			'user_email' => 'count_user_posts_user@example.com',
 		) );
 
 		self::$post_ids = $factory->post->create_many( 4, array(